They are used as radio waves, infrared radiation, visible light.
We can see from Dr. Aguilera's findings that high levels of anxiety are associated with poor academic performance. However, the number of hours of sleep has little bearing on how well or poorly a student does in class.
The confounding variable is important to avoid obstacles to the measurement
<h3>How to illustrate the information?</h3>
Dr. Aguilera discovered a strong link between anxiety and academic achievement. Additionally, this number is negative, indicating a negative correlation between the two variables. According to this negative correlation, the value of the other variable decreases as the value of the first variable increases. Therefore, academic performance declines when anxiety levels rise.
The term "correlation" describes the connection between two variables. In other words, if the correction equals 0, there is no correlation between the two variables. The relationship between sleep duration and academic performance was zero. This indicates that these factors are unrelated and have no bearing on one another.
The Cohort effect is crucial to avoid obstacles to the measurement and research methodologies used, nevertheless.
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Answer: They led to larger urban cores that used professional armies to increase their territory and enslave people.
Explanation:
Trade generally brings about wealth and this was the case for West African societies as a result of interactions with the Muslim traders who crossed the Sahara to trade with them.
As a result of the gains from trade, wealthy urban cores and cities were formed such as Timbuktu, Gao and Agadez
. The wealth the rulers of these cities acquired enabled them to use professional armies to conquer more territory.
Indeed one of the richest men in history, Mansa Musa ruled over an empire that became so rich due to trade in his territory.
